Java MD5 加密类

import java.security.MessageDigest;

public class MD5 {

    public MD5() {
    }

    private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

    public static String MD5Encode(String code) {
        String NewCode = null;
        try {
            NewCode = new String(code);
            MessageDigest MD = MessageDigest.getInstance("MD5");
            NewCode = byteArrayToHexString(MD.digest(NewCode.getBytes()));
        } catch (Exception exception) {
        }
        return NewCode;
    }

    public static String byteArrayToHexString(byte bts[]) {
        StringBuffer str = new StringBuffer();
        for (int i = 0; i < bts.length; i++)
            str.append(byteToHexString(bts[i]));
        return str.toString();
    }

    private static String byteToHexString(byte bt) {
        int Num = bt;
        if (Num < 0)
            Num += 256;
        int Int = Num / 16;
        int ox = Num % 16;
        return hexDigits[Int] + hexDigits[ox];
    }
}